The scope of this tender is to procure a framework agreement, which enables DMI to purchase meteorological weather balloons over a four-year period. This agreement will enable DMI to conduct and collect upper-air meteorological measurements that provide inputs to numerical weather predictions and additionally are used for other purposes consistent with DMI’s general work scope and obligations as National Meteorological Service and contributor to international collaboration. The weather balloons will be used for radiosonde measurements which will be conducted from DMI’s manually operated radiosonde stations (four in Greenland and three established onboard ships sailing between Denmark and Greenland). The deliveries will consist of meteorological weather balloons with necks.